I've found in Doomwiki that demo version of this game is quite different than retail game, therefore I decided to record it. Instead of Veteran Edition I use GZDoom with vanilla .wad file, because I don't like lightmaps and bloom implemented to modified Doom engine. Also in GZDoom I can use advantage of hardware accelaration (such as support of widescreen resolution, texture filtering, uncapped framerate) and most importantly multiple saves states feature for the same playthrough. If you bought Veteran Edition you can still use its .wad file with GZDoom (maybe I'll record side quest exclusive to Veteran Edition with getting overpowered melee attack).
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